<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*标签选择器*/
        span{
            color: orange;
        }
        /*class名称选择器*/
        .my-text-03{
            font-size: 100px;
        }
    </style>
</head>
<body>
    <span class="my-text-01">这是span1</span>
    <span class="my-text-02">这是span2</span>
    <span class="my-text-03">这是span3</span>
    <span class="my-text-04">这是span4</span>
    <span class="my-text-05">这是span5</span>
</body>
</html>